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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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992 Michel Bauer, Christine Barthélémy<br />

Table 14.21.1.9. Water quality<br />

ture elucidation. In the book by Reichardt, 1 data regarding the cut-<strong>of</strong>f points <strong>of</strong> solvents<br />

commonly used in UV/visible spectroscopy are provided. The cut-<strong>of</strong>f point is defined as the<br />

wavelength in the ultraviolet region at which the absorbance approaches 1.0 using a 1-cm<br />

cell path with water as the reference. In the same way the range <strong>of</strong> transparency for IR-solvents<br />

are given. Complete IR-spectra <strong>of</strong> organic solvents can be found in the “Stadler IR<br />

spectra handbook <strong>of</strong> common organic solvents” . The solvents suppliers usually provide<br />

catalogues including a “spectroscopic grade” allowing the user to make a sound choice.<br />

In the case <strong>of</strong> the NMR spectroscopy problems arise with the residual protonated part<br />

<strong>of</strong> deuterated solvents ( 1 H-NMR) and the 13 C-NMR absorption bands <strong>of</strong> compounds used as<br />

solvents. References can be found 1 where detailed data are given regarding these points.

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